Milling process

TiO₂ lead (% w/w)^a

PEG concentration (% v/v)^a

Stirring speed (rpm)

Milling time (min)

NP1

3

0

1375

240

NP2

10

0

2375

60

SP1

3

0.5

1375

240

SP2

10

0.5

2375

60